饱和砂的动孔压演化特性试验研究
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摘要
利用GDS 10 Hz/20 kN双向振动三轴系统,对饱和砂进行不排水动三轴液化试验,研究了液化进程中动孔压的发展规律,并阐述了动孔压的演化机理.基于试验结果,提出适用于饱和砂的动孔压应变模型.该模型直接和动力分析中应变幅相联系,能够弥补应力模型的不足,并具有较好的适用性.等压固结条件下,动应力和固结压力对动孔压比与动应变比的关系影响较小,动孔压发展规律可近似用同一模型表示.不同动应力和固结压力作用下,饱和砂土动孔压的增长模式用Seed提出的孔压应力模型描述时,试验常数可取相同值.
With the GDS 10 Hz/20 kN dynamic triaxial system,undrained tests on the saturated sands during liquefaction process were performed.Development of dynamic pore water pressure of saturated sands during liquefaction process was studied and its evolution mechanism was represented.Based on the results,a practical strain model of dynamic pore water pressure under isotropic consolidation was proposed.The model relates with the strain amplitude in dynamic analysis directly,which can make up for the deficiency of stress pore water pressure model and has better applicability.There is little effect on the relationship between dynamic pore water pressure ratio and dynamic strain ratio from the variation of dynamic stress and confining pressure under isotropic consolidation and the law of dynamic pore water pressure can be described by the same model.The test constant can adopt an identical value when the characteristics of dynamic pore water pressure is described by dynamic pore water pressure model under isotropic consolidation proposed by Seed in different dynamic stresses and confining pressures.
With the GDS 10 Hz/20 kN dynamic triaxial system,undrained tests on the saturated sands during liquefaction process were performed.Development of dynamic pore water pressure of saturated sands during liquefaction process was studied and its evolution mechanism was represented.Based on the results,a practical strain model of dynamic pore water pressure under isotropic consolidation was proposed.The model relates with the strain amplitude in dynamic analysis directly,which can make up for the deficiency of stress pore water pressure model and has better applicability.There is little effect on the relationship between dynamic pore water pressure ratio and dynamic strain ratio from the variation of dynamic stress and confining pressure under isotropic consolidation and the law of dynamic pore water pressure can be described by the same model.The test constant can adopt an identical value when the characteristics of dynamic pore water pressure is described by dynamic pore water pressure model under isotropic consolidation proposed by Seed in different dynamic stresses and confining pressures.
引文
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[11]何杨,栾茂田,许成顺,等.复杂应力条件下松砂振动孔隙水压力与体变特性的试验研究[J].地震工程与工程振动,2005,25(6):127.HE Yang,LUAN Maotian,XU Chengshun,et al.Experimentalstudy on cyclic pore water pressure and volumetric changes ofsaturated loose sans under complex stress condition[J].Earthquake Engineering and Engineering Vibration,2005,25(6):127.
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[13]汪闻韶.土的动力强度和液化特性[M].北京:中国电力出版社,1997.WANG Wenshao.The dynamic strength and liquefactioncharacteristics of soil[M].Beijing:China Electric Power Press,1997.
[2]Seed H B,Martin P P,Lysmer J.Pore-water pressure changesduring soil liquefaction[J].Journal of Geotechnical EngineeringDivision:American Society of Civil Engineering,1976,102(4):323.
[3]Finn W D L,Lee K W,Maartman C H,et al.Cyclic porepressures under an isotropic conditions[C]∥Proceedings ofAmerican Society of Civil Engineering Specialty Conference onEarthquake Engineering and Soil Dynamics.New York:ASCE,1978:451-471.
[4]Chang S C,Kuo C L,Selig E T.Pore-water pressure changesduring cyclic loading[J].Journal of Geotechnical EngineeringDivision:American Society of Civil Engineering,1983,109(4):103.
[5]徐志英,沈珠江.地震液化的有效应力二维动力分析方法[J].河海大学学报,1981(3):1.XU Zhiying,SHEN Zhujiang.2-D dynamic analysis of effectivestresses of seismic liquefaction[J].Journal of HohaiUniversity,1981(3):1.
[6]陈国兴,刘雪珠.南京粉质黏土与粉砂互层土及粉细砂的振动孔压发展规律研究[J].岩土工程学报,2004,26(1):79.CHEN Guoxing,LIU Xuezhu.Study on dynamic pore waterpressure in silty clay interbedded with fine sand of Nanjing[J].Chinese Journal of Geotechnical Engineering,2004,26(1):79.
[7]王权民,李刚,陈正汉,等.厦门砂土的动力特性研究[J].岩土力学,2005,26(10):1628.WANG Quanmin,LI Gang,CHEN Zhenghan,et al.Research ondynamic characteristics of sands in Xiamen city[J].Rock andSoil Mechanics,2005,26(10):1628.
[8]靳建军,张鸿儒.砂土液化特性MTS动三轴试验研究[J].北京交通大学学报,2006,30(4):60.JIN Jianjun,ZHANG Hongru.Study on sand liquefactioncharacteristics by MTS dynamic tri-axial test[J].Journal ofBeijing Jiaotong University,2006,30(4):60.
[9]谢定义.土动力学[M].西安:西安交通大学出版社,1988.XIE Dingyi.Soil dynamics[M].Xi’an:Xi’an JiaotongUniversity Press,1988.
[10]Martin G R,Finn W D L,Seed H B.Fundamentals ofliquefaction under cyclic loading[J].Journal of the GeotechnicalEngineering Division:American Society of Civil Engineering,1975,101(S):423.
[11]何杨,栾茂田,许成顺,等.复杂应力条件下松砂振动孔隙水压力与体变特性的试验研究[J].地震工程与工程振动,2005,25(6):127.HE Yang,LUAN Maotian,XU Chengshun,et al.Experimentalstudy on cyclic pore water pressure and volumetric changes ofsaturated loose sans under complex stress condition[J].Earthquake Engineering and Engineering Vibration,2005,25(6):127.
[12]周海林,王星华.动三轴实验中的饱和砂土孔隙水压力分析[J].铁道学报,2002,24(6):93.ZHOU Hailin,WANG Xinghuan.Study on the pore waterpressure of saturated sand in dynamic triaxial test[J].Journalof the China Railway Society,2002,24(6):93.
[13]汪闻韶.土的动力强度和液化特性[M].北京:中国电力出版社,1997.WANG Wenshao.The dynamic strength and liquefactioncharacteristics of soil[M].Beijing:China Electric Power Press,1997.
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